I've seen a few help guides and I remember one of them mentioning that in order to high press effectively you should have more offense than the opponent has defense.
that's just a theory- scenario.
I don't know how can some one prove it in the game.

Also, if you're high pressing I'm assuming you would want to be in attack mode which would mean you should have the trap in affect, yes?
yes, that's the "pack". Specially if you want to "reverse" a bad result.
But nothing guarantees it 'll work